ATAGO NAR-2T Manuel utilisateur

Abbe Refractometer

Instruction Manual Cat.No.1220

1220-E28

PRODUCT REGISTRATION & WARRANTY CARD

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(1) Preparation of refractometer13

(2) Connection with circulating constant temperature bath15

Contents

Page

Precautions for use2

Refractive Index and Brix8

Unpacking and Setting-up9

Names and Functions of main parts

Power-on17

Calibration (Scale adjustment)

Finding average dispersion value and Abbe number37

Cleaning and maintenance42

Replacement of consumable supplies and component parts

(Simultaneous analysis of insoluble solids, sugar and water)

(1) Measuring glass, plastic samples25

(2) Measuring film samples28

(3) Measuring of double refraction samples30

Preparation for measurement

12.

13.

14.

(1) Main unit of NAR-2T 10

(2) Digital thermometer12

(3) How to use Illuminator Selector Switch12

Measurement of liquid sample238.

(1) When measuring colored or cloudy sample35

(2) Discoloration or "Burning" of the main Prism35

(3) Measurement method of pasty sample35

(4) For measuring liquid sample containing insoluble solids36

Measurement of solid sample

(1) Calibration with distilled water18

(2) Calibration with test piece20

Measurement of powdered sample3310.

Situations that may require additional attention

11.

Relation between Brix percent and Refractive Index (nD)49

Temperature correction table for sucrose solution50

Specifications 51

Repair and warranty52

ATAGO CO.,LTD. Service Center53

15.

16.

17.

18.

19.

(1) Prism 44

(2) LED lamp46

(3) Thermo-sensor unit47

(4) Desiccant48

Introduction

1. Precautions for use

For safe use --- Be sure to observe the following.

Explanation of indications

WARNING

CAUTION

Explanation of symbols

This symbol denotes an item which you are warned (or cautioned) of.

The contents of warning are described in detail in or near the ڹ.

This symbol denotes an action which you must not do (a prohibited item).

The contents of prohibition are described in detail in or near the ۑ.

This symbol denotes an action you must do.

The contents of instruction are described in detail in or near the ە.

Thank you for purchasing the "ATAGO, Abbe Refractometer NAR-2T". Before using your NAR-2T,

read this instruction manual carefully and understand how to use it. After reading this manual,

keep it on hand for future reference.

In this manual "For safe use" describes the important items necessary for safety. Read it

carefully.

This operation manual describes the items which you are required to observe in order to use

the NAR-2T safely to prevent injury to you and other people and damage to your property.

The explanation of the indications and symbols of those items are as follows. Understand them

first and then read the following pages to use your NAR-2T correctly.

If this indication is neglected and the instrument is handled

incorrectly, the user may be seriously injured and may result

in death.

If this indication is neglected and the instrument is handled

incorrectly, the user may be injured and the user's property

may be damaged.

Handling of this instrument

WARNING

CAUTION

When measuring a substance harmful to

the human body, be well aware of its

properties and put on protective gloves,

mask, etc.

If the instrument begins to smell

abnormally, overheat, or emit smoke, turn

off the power switch and disconnect the

power plug immediately.

Fire or malfunction may result if the

instrument is continued to be used.

Ask your ATA G O distributor for an inspection.

Do not attempt to repair, modify, or

disassemble the instrument yourself.

Improper servicing may result in fire,

electrical shock, or burns.

If the instrument is dropped or is subjected

to a strong shock, have it inspected by an

ATAGO distributor.

Fire or malfunction may result if the

instrument is used.

Do not apply water or sample over any part

other than the surface of the prism.

Application on any other part of the

instrument may result in a malfunction.

If this instrument is used to measure very

hot or highly acidic sample, the prism may

be damaged resulting in inaccurate

measurements.

1. Precautions for use

Handling of this instrument (Continued)

CAUTION

The prism is made of optical glass. Do

not tap or contact its surface with any

metal tool such as a spoon or

tweezers.

If the surface of the prism is damaged,

inaccurate measurements will occur.

After taking a measurement, completely

wipe off any sample on the surface of the

prism and surrounding area with tissue

paper soaked in water.

Then remove any remaining moisture

completely with dry tissue paper.

If you have measured a sample of

polymer or fats and oils, wipe it off with

tissue paper soaked in alcohol or

neutral detergent.

Then remove any remaining moisture

completely with dry tissue paper.

Always turn off the power switch after

use.

When transporting the instrument,

place it in its original box.

Carefully read this instruction manual and fully understand the function and operation of

each part of the instrument before use.

Check that each part of the instrument operates normally before use.

Check the necessary operations such as calibration according to the instruction manual.

The manufacturer shall not be held responsible for any or all damages as a result of use

of the instrument for those other than its intended purposes (measurement of Brix, Refractive

Index, Concentration).

The prism mounted on the sample stage that is in contact with a sample under measurement

is a consumable item.

Ensure that if use of the instrument has undesired effects on the consumption of the

measured materials, etc., ATAG O shall not be held responsible for the result.

1. Precautions for use

Handling of plug

WARNING

CAUTION

ەDon't plug the power cable into an outlet

other than AC100 to 240V.

Inserting the power plug in any other

outlet may result in shortcircuiting the

unit, smoking or fire.

ەDo not use the power cable if damaged

or broken.

If used, fire, electrical shock, or burns

may result.

For a new power cable, contact your

ATAGO distributor.

ەDo not insert or disconnect the power

plug with wet hands.

ەBe sure to hold and pull the plug when

disconnecting the power cable from the

outlet.

If the cable is pulled improperly, the plug

may be broken, and may result in fire or

electrical shock.

1. Precautions for use

Connection of circulating constant temperature bath

WARNING

ەFor connecting a circulating constant

temperature bath with the refractometer,

make sure to use the elicon tube (made

of vinyl chloride).

Moreover, tightly fasten each joint part

between the nozzle and tube with the

tie band.

The temperature of hot water to be

supplied from a circulating constant

temperature bath to this refractometer

is limited to 120Υ, and the flow rate of

the circulating constant temperature

bath should be 10 L/min. at maximum

through a nozzle of 6mm caliber.

To o much discharge not only increases

water pressure but also may cause

disconnection between the nozzle and

tube or may overload the water channel

inside the refractometer.

If the tube is damaged, replace it with

new one as immediately as possible.

If the damaged tube is continuously used,

the operator may scald himself with hot

circulating water.

ەPay careful attention to hot circulating

water.

1. Precautions for use

Items to be observed when using

1. Precautions for use

Do not drop the instrument or subject it to any strong shock.

The power cable may be damaged if mishandled in any of the following ways.

࣭Bending the cable.

࣭Pulling the cable.

࣭Twisting the cable.

࣭Placing the cable under heavy objects.

࣭Catching the cable between objects.

If the instrument becomes dirty, wipe it with a soft cloth.

Do not use benzine, paint thinner, etc. to clean the instrument.

Environmental conditions

Handling

Daily maintenance

Use the instrument at an altitude below 2,000m (above sea level).

Use the instrument indoors.

Use the instrument on a flat and level surface such as a desk or table.

Use the instrument where the temperature is between 5 to 40䉝.

Do not leave the instrument in a location exposed to direct sunlight or near a heating unit

where the temperature may rise.

Do not change the environmental temperature of the instrument suddenly.

Do not place the instrument in a place where it may be subject to strong vibrations.

Do not use the instrument where there is much dust.

Do not leave the instrument where the temperature is extremely low.

Do not leave the instrument in a damp place.

Do not place or drop heavy objects on the instrument.

Use the instrument under the condition where humidity is 80% at 31䉝or lower, falling linearly

to 50䠂at 40䉝.

Main supply voltage fluctuation should not to exceed 㼼10% the nominal voltage.

Installation categories (Overvoltage Categories): 䡈䡈

The pollution degree is 2 (according to IEC60664).

When light goes to medium Ȯthrough air with an

Refractive Index of air in the atmospheric pressure

assumed as 1, the ratio of the sine of incident angle

Șagainst the interface to the sine of refractive

angle șis called the Refractive Index of the medium.

Since the Refractive Index changes due to the

temperature, and wavelength of light, it is expressed

as follows:

1. What is a refractometer?

2. Refractive Index and Brix

If you put a straw into a glass of water, the straw appears bent. If the water contains

concentrations of sugar, the straw will appear more bent. This is called the "phenomenon of

light refraction". The refractometer applies this principle (if a solution has a higher concentration,

its Refractive Index rises proportionally). The refractometer is a measuring instrument devised

by Dr. Ernst Abbe in Germany in the early 20th century.

2. What is Refractive Index?

3. Brix scale

Note:

The scale of the NAR-2T is a Brix scale that is based on the Refractive Index of water

(nD=1.33299=Brix 0.0%). Brix means the scale of the weight (%) of sucrose (grams of

sucrose contained in 100 grams of sucrose solution). Thus, if a sucrose solution is

measured, it matches this concentration. However, almost all foods contain not only sugar,

but also a variety of dissolved components such as salt and protein. The total

concentration of these water-soluble materials is called the soluble solid content. When

this sample is measured, Brix is almost consistent with the soluble solid content (%) and is

used as a practical scale.

* The Brix scale is expressed in % mass (Sucrose) as the International System of Units

(SI unit).

For example, the Refractive Index of water at 20Υ

for the D line is expressed as ࠉ= 1.33299

(generally it is expressed in the form of nD=1.33299).

For relation between Brix percentage and refractive and Refractive Index (nD),

refer to page 49.

boundary

air

mediumȮ

㹬

㹬=

sin Ș

sin ș

n20

n : Represents the Refractive Index

t : Te m perature(Υ)

D : D- line of sodium

Note: The Refractive Index measured by setting the

Refractive Index of vacuum to 1 is called the

absolute Refractive Index, but it is generally

scarcely used.

●Abbe Refractometer NAR-2T (main unit)

………………………………1

●Digital thermometer………………………………………………………………1

●AC Power cable……………………………………………………………………1

●Lamp cable(

LED lamp : 2)

…………………………………………………1

●

Test piece

………………………………………………………………………1

●

Contact liquid (monobromonaphthalene)………………………………1

●

Instruction manual (this book)

…………………………………………………1

●

Inspection certificate………………………………………………………1

3. Unpacking and Setting-up

1. Unpacking

2. Setting-up

Take all contents out of the packing case and check every item whether there is any damage

exteriorly or not.

Confirm the contents so that the following articles have been contained in the package

without lack.

Connect this refractometer to a mains outlet of AC100 to 240V, 50/60 Hz.

Set this refractometer in a place where it can be operated at an ambient temperature from

5 to 40℃.

Since this refractometer has extremely precise component parts inside, set it in an optimum

place where it is free from direct rays of the sun, strong vibration, dust, corrosive gas, heat

source.

Set this refractometer on a solid and level surface of a warkbench, etc. When setting, be

very careful not to give a strong shock to it.

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